Horseshoe-calk.



' No. 863,908 PATENTED AUG. 20, 1907.

e. G. EIQHSTABDT. HORSESHOE GALK.

APPLICATION FILED PEB- 5, 1907.

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GUSTAVE G. EIGHSTAEDT, OF SHEBOYGAN, WISCONSIN.

HORSESHOE-CALK.

Specification of Letters Patent.

Patented Aug. 20, 1907.

Application filed February 5, 1907. Serial No. 355,853.

To all whom it may concern:

Be it known that I, GUSTAVE G. EICHSTAEDT, a citizen of the United States,'residing at Sheboygan, in the county of Sheboygan and State of Wisconsin, have 1 invented certain new and useful Improvements in Horseshoe-Calks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to removable calks for horseshoes; and it consists in the novel construction and combination of the parts hereinafter fully described and claimed.

- In the drawings, Figure 1 is a vertical section through a calk constructed according to this invention. Fig. 2 is a plan view of the same.

A is the projecting portion of the calk which is of any approved form and which is pointed so as to engage with the ground, and B is the shank of the calk which is screwthreaded so as to engage with a screw threaded hole in the horse-shoe.

D is a shoulder at the base of the shank which bears against the bottom of the horse-shoe. The calk and its shank are forged of iron or soft steel, and it is provided with a cylindrical core d of hard steel. This hard steel core is forged first, and the call; is subsequently forged so as to inclose the core which extends longitudinally within the projecting portion of the calk from its shoulder to its point.

In order to remove the calk two wrench holes 6 are drilled in the shank eccentric of the central core d of steel. These holes extend through the shank to a little distance below the shoulder D and overlap the upper end portion of the core (I. When the calk is worn off short these wrench holes are uncovered and a wrench of approved construction can be inserted in them to unscrew the calk. The shank is not weakened by the core d, as the core does not extend above the shoulder, and the core does not obstruct or break the drill in forming the holes 2.

What I claim is:

1. A calk provided with a screwthreaded shank and a shoulder, and haxing a central core of hard metal extending from its said shoulder to its point, and two wrench holes formed eccentric of the said core and extending through the said shank into the body of the calk and overlapping the upper end portion of the said core.

2. A call: provided with a screwthreaded shank and a shoulder, and having a central core of metal which is harder than its body portion, the said shank having wrench holes arranged eccentric of the said core and extending longitudinally through the shank to a point below the said shoulder and overlapping the upper end 01' the said core.

In testimony whereof I have aflixed my signature in the presence of two witnesses.

GUSTAVE G. EICIISTAEDT,

Witnesses WM. H. Gnonn, W. V. Monvi'rz. 

